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[client] Rebind the file drop receiver when the tun is renewed

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Android re-establishes the VpnService interface on every route change, which
replaces tun0 with a fresh device. The file drop listeners are bound to the
overlay address of the interface being swapped out: the IPv4 one dies with
accept4: invalid argument and never comes back, so a peer dialing the overlay
IPv4 address gets an RST. Restart the receiver once the new device is in place.
This commit is contained in:
Zoltan Papp
2026-08-17 00:16:57 +02:00
parent 73cffdb702
commit a94424d563
2 changed files with 24 additions and 1 deletions
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client/internal/engine_filedrop.go
+16
View File
@@ -103,6 +103,22 @@ func (e *Engine) setFileDropTunnel() {
e.fileDrop.SetTunnel(dial, e.statusRecorder.GetLocalPeerState().FQDN)
}
// restartFileDrop rebinds the receiver after the platform replaced the tunnel
// device. The listeners are bound to the overlay address of the interface being
// swapped out and do not survive it: Android renews the tun on every route
// change, which leaves the IPv4 listener dead with accept4: invalid argument.
func (e *Engine) restartFileDrop() {
e.syncMsgMux.Lock()
defer e.syncMsgMux.Unlock()
if e.fileDrop == nil || !e.fileDropRunning || e.wgInterface == nil {
return
}
e.stopFileDrop()
e.startFileDrop()
}
func (e *Engine) stopFileDrop() {
if e.fileDrop == nil {
return